Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32b41219cb3aa13…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 21:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa3fb19ee4812bc340f7a85a21650e15 SHA-1: 0e7be4bd960ac522484a3f8e9a05f13d7d453a21 SHA-256: a32b41219cb3aa13d171ec48c06242eb30a3afc353525c22ed69593057421ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://santevita-bg.com/ckfinder/userfiles/files/51122868185.pdf In PDF document text
    • http://gaytonfa.com/upload/files/fomowivov.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/zonutozo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/082c861f10e8e9408f7a8a4b4c9fbf44/45498373106.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140126cacfa5---wegobuwepefalupiwig.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b893f2b37---64485342008.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/10032022834.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/xetujiribatip.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/tewafusafunudadetiboti.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d397f6b62abddd0295ba82d218116aa5/wawisavobiripumalinov.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/tamokuvuzuxif.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141a2c57f189---pogafinoso.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/zuvupopujibajanaz.pdfIn PDF document text
    • https://motoralbini.it/files/file/zitizoxisiv.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/9122537650.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/951811871.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf078b66a---44118017877.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/dojobesujiwepesizup.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/12576825338.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/98807411884.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/xajavikuvotodibukafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=steam+link+android+tv+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 20720 bytes
SHA-256: 58d49a856e38f0956ceb02340e74053668a7fa9e2024d7b40c154c6ea16135ff
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 10620 bytes
SHA-256: 7eeb88ec46a72403e6efaa1e4e245790a4c1a12271deb7d54932853676c718b5